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Geographic Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information
Consolidated revenue	$ 2,329.6	$ 2,412.4	$ 2,027.5
Fixed assets (net)	68.5	73.9
United States
Segment Reporting Information
Consolidated revenue	1,852.6	1,838.7	1,524.0
Fixed assets (net)	57.5	58.7
United Kingdom
Segment Reporting Information
Consolidated revenue	434.8	528.6	462.3
Fixed assets (net)	10.6	14.6
Other
Segment Reporting Information
Consolidated revenue	42.2	45.1	$ 41.2
Fixed assets (net)	$ 0.4	$ 0.6

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